Update {virtual,override,final} to follow C++11 style in net.

net/android/network_change_notifier_android.h

Index: net/android/network_change_notifier_android.h
diff --git a/net/android/network_change_notifier_android.h b/net/android/network_change_notifier_android.h
index 0d90a5648da01399ccebe2ffb409e3b4fb01fc02..f6d43d011298e7247d452a89ad63f497f71c6a3c 100644
--- a/net/android/network_change_notifier_android.h
+++ b/net/android/network_change_notifier_android.h
@@ -42,17 +42,17 @@ class NET_EXPORT_PRIVATE NetworkChangeNotifierAndroid
     : public NetworkChangeNotifier,
       public NetworkChangeNotifierDelegateAndroid::Observer {
  public:
-  virtual ~NetworkChangeNotifierAndroid();
+  ~NetworkChangeNotifierAndroid() override;
 
   // NetworkChangeNotifier:
-  virtual ConnectionType GetCurrentConnectionType() const override;
+  ConnectionType GetCurrentConnectionType() const override;
   // Requires ACCESS_WIFI_STATE permission in order to provide precise WiFi link
   // speed.
-  virtual double GetCurrentMaxBandwidth() const override;
+  double GetCurrentMaxBandwidth() const override;
 
   // NetworkChangeNotifierDelegateAndroid::Observer:
-  virtual void OnConnectionTypeChanged() override;
-  virtual void OnMaxBandwidthChanged(double max_bandwidth_mbps) override;
+  void OnConnectionTypeChanged() override;
+  void OnMaxBandwidthChanged(double max_bandwidth_mbps) override;
 
   static bool Register(JNIEnv* env);